Gas insulator switchgear



FIG. 1 is a perspective view of a front, left side, and top of an ornamental design for a gas insulator switchgear;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view of thereof. 

CLAIM The ornamental design for a gas insulator switchgear, as shown and described. 